In this Funday Monday, you may only build New Heart of the Swarm Units Units that have been changed for Heart of the Swarm (ie Hydralisks because of Hydra speed, Medivacs due to the boost, Mutalisks because of the speed change etc) One additional unit of your choosing (you have to announce it at the start of the game!) Workers, Observers, Overseers, Queens, and Mules are all fine to build as many of as you like :]. Would be too hard without them!